android md5加密与加密与rsa加解密实现代码加解密实现代码
代码如下:
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5 {
/*
* MD5加密
*/
public static String getDigest(String str) {
MessageDigest messageDigest = null;
try {
messageDigest = MessageDigest.getInstance(“MD5”);
messageDigest.reset();
messageDigest.update(str.getBytes(“UTF-8”));
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
byte[] byteArray = messageDigest.digest();
StringBuffer md5StrBuff = new StringBuffer();
for (int i = 0; i < byteArray.length; i++) {
if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
md5StrBuff.append(“0”).append(Integer.toHexString(0xFF & byteArray[i]));
else
md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
}
return md5StrBuff.toString().toUpperCase();
}
}
代码如下:
import java.math.BigInteger;
import java.security.Key;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.spec.RSAPublicKeySpec;
import javax.crypto.Cipher;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public class RSAUtil {
/**
* 加密
*
* @param message
* @return
*/
public static String encrypt(String message) {
byte[] result = null;
try {
result = encrypt(message, getPublicKey());
} catch (Exception e) {
e.printStackTrace();
}
return toHexString(result);
}
/**
* 解密
*
* @param message
* @return
*/
public static String decrypt(String message) {
byte[] result = null;
try {
result = decrypt(message, getPublicKey());
} catch (Exception e) {
e.printStackTrace();
}
return new String(result);
}
/**
* 加密(公钥加密、私钥加密)
*
* @param message 待加密的消息
* @param key 公钥或私钥
* @return
* @throws Exception
*/
private static byte[] encrypt(String message, Key key) throws Exception {
Cipher cipher = Cipher.getInstance(“RSA”, new BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, key);
// 注意中文的处理
return cipher.doFinal(message.getBytes(“gb2312”));
}
/**
* 解密(如果公钥加密，则用私钥解密；如果私钥加密，则用公钥解密)
*
* @param message 待解密的消息
* @param key 公钥或私钥
* @return
* @throws Exception
*/
private static byte[] decrypt(String message, Key key) throws Exception {
Cipher cipher = Cipher.getInstance(“RSA”, new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, key);
return cipher.doFinal(toBytes(message));
}
/**
* 通过模长和公钥指数获取公钥
*
* @param modulus 模长
* @param publicExponent 公钥指数
* @return
* @throws Exception
*/
public static PublicKey getPublicKey() {
PublicKey publicKey = null;
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